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LM5176: VIN=12V, Io=3A的时候会出现次谐波震荡

nles1214
Prodigy 111 points
Part Number: LM5176

在使用LM5176这个料设计一款输入VIN=6~36V，输出12V/3A的电源，Fsw=300kHz。在输入电压VIN=6~11V以及VIN=13~36V带载输出均正常，但是在VIN=12V的时候，SW波形有大小波现象：

Comp补偿引脚的电阻电容以及Cslope是按照ti提供的 LM5176 Quick Start tool excel计算表格里面推荐的数值。

请问：这个现象是什么原因呢？